Dendritic solidification and fragmentation in undercooled Ni-Zr alloys
Dendritic solidification and fragmentation in undercooled Ni-Zr alloys
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DOI：
10.1016/j.msea.2006.02.435
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发表时间：
2007-03
期刊：
影响因子：
6.4
通讯作者：
P. Galenko;Phanikumar Gandham;O. Funke;L. Chernova;S. Reutzel;M. Kolbe;D. Herlach
中科院分区：
文献类型：
--
作者：
P. Galenko;Phanikumar Gandham;O. Funke;L. Chernova;S. Reutzel;M. Kolbe;D. Herlach
研究了过冷Ni-Zr合金枝晶凝固动力学和枝晶破碎动力学。采用电容式近接传感器技术和高速摄像系统，测量了电磁悬浮凝固液滴中枝晶生长速度与初始过冷度的关系。凝固液滴的分析给出了证据的过渡从粗晶枝晶细化枝晶（CG-GR）在小的过冷度，过渡从晶粒细化枝晶粗晶枝晶（GR-CG）在中等过冷度，和第二次过渡从粗晶枝晶细化枝晶（CG-GR）在较高的过冷度。尖锐的界面模型的预测进行了比较与Ni-Zr样品的实验结果。
Kinetics of dendritic solidification and fragmentation of dendritic crystals in undercooled Ni–Zr samples are studied. Using the capacitance proximity sensor technique and a high-speed-camera system, the dendrite growth velocity has been measured as a function of initial undercooling in solidifying droplets processed by the electromagnetic levitation technique. Analyses of solidified droplets give evidence to a transition from coarse grained dendrites to grain refined dendrites (CG-GR) at small undercooling, a transition from grain refined dendrites to coarse grained dendrites (GR-CG) at moderate undercooling, and to a second transition from coarse grained dendrites to grain refined dendrites (CG-GR) at a higher undercooling. Predictions of a sharp-interface model are compared with the results of experiments on Ni–Zr samples.